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2, 4, 20, 72, 255, 874, 2903, 9336, 29578, 92528, 285992, 875912, 2662819, 8042606, 24156735, 72211820, 214959872, 637526372, 1884571600, 5554575752, 16328272725, 47884030342, 140118979793, 409205295972, 1192876666588, 3471548282192
(列表;图表;参考;听;历史;文本;内部格式)
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